21531432235324 has 24 divisors (see below), whose sum is σ = 43523429867568. Its totient is φ = 9211307907840.

The previous prime is 21531432235259. The next prime is 21531432235351. The reversal of 21531432235324 is 42353223413512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14392667859 + ... + 14392669354.

It is an arithmetic number, because the mean of its divisors is an integer number (1813476244482).

Almost surely, 2^{21531432235324} is an apocalyptic number.

It is an amenable number.

21531432235324 is an abundant number, since it is smaller than the sum of its proper divisors (21991997632244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21531432235324 is a wasteful number, since it uses less digits than its factorization.

21531432235324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28785337245 (or 28785337243 counting only the distinct ones).

The product of its digits is 518400, while the sum is 40.

Adding to 21531432235324 its reverse (42353223413512), we get a palindrome (63884655648836).

The spelling of 21531432235324 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty-two million, two hundred thirty-five thousand, three hundred twenty-four".